sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, often associated with iron-rich fluids that provide the red coloring.
Uses & applications
Commonly used as a gemstone for cabochons, beads, and carvings. Also used in ornamental architecture and as a healing stone in metaphysical practices.
Geological facts
Red Jasper has been used since antiquity as a 'warrior stone.' It was set into the hilts of swords and used as protective amulets by the Vikings and ancient Egyptians.
Field identification & locations
Identified in the field by its opaque red color, smoothness when weathered, and its inability to be scratched by a steel knife. Frequently found in riverbeds and gravel pits in volcanic regions.
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